{"id":58737,"date":"2025-08-16T15:00:11","date_gmt":"2025-08-16T07:00:11","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/58737.html"},"modified":"2025-08-16T15:00:11","modified_gmt":"2025-08-16T07:00:11","slug":"%e5%af%86%e7%a0%81%e5%ad%a6%e5%85%a5%e9%97%a8%e7%ac%94%e8%ae%b04%ef%bc%9a%e5%88%86%e7%bb%84%e5%af%86%e7%a0%81%e5%b8%b8%e8%a7%81%e7%ae%97%e6%b3%951-des","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/58737.html","title":{"rendered":"\u5bc6\u7801\u5b66\u5165\u95e8\u7b14\u8bb04\uff1a\u5206\u7ec4\u5bc6\u7801\u5e38\u89c1\u7b97\u6cd51\u2014\u2014DES"},"content":{"rendered":"<p>\u672c\u6587\u4e3a\u4e2a\u4eba\u5b66\u4e60\u603b\u7ed3&#xff0c;\u5982\u6709\u8c2c\u8bef\u6b22\u8fce\u6307\u6b63\u3002\u5bc6\u7801\u5b66\u535a\u5927\u7cbe\u6df1&#xff0c;\u540e\u7eed\u5c06\u7ee7\u7eed\u8bb0\u5f55\u5176\u4ed6\u77e5\u8bc6\u70b9&#xff01;<\/p>\n<p id=\"main-toc\">\u76ee\u5f55<\/p>\n<p id=\"%E5%89%8D%E8%A8%80-toc\" style=\"margin-left:0px\">\u524d\u8a00<\/p>\n<p id=\"%E4%B8%80%E3%80%81%E4%BB%8B%E7%BB%8D-toc\" style=\"margin-left:0px\">\u4e00\u3001\u4ecb\u7ecd<\/p>\n<p id=\"%E4%BA%8C%E3%80%81%E5%8A%A0%E5%AF%86%E6%B5%81%E7%A8%8B%E2%9A%A0%EF%B8%8F-toc\" style=\"margin-left:0px\">\u4e8c\u3001\u52a0\u5bc6\u6d41\u7a0b\u26a0\ufe0f<\/p>\n<p id=\"%E6%89%A9%E5%B1%95%E7%BD%AE%E6%8D%A2E-toc\" style=\"margin-left:80px\">\u6269\u5c55\u7f6e\u6362E<\/p>\n<p id=\"S%E7%9B%92%E6%9B%BF%E6%8D%A2-toc\" style=\"margin-left:80px\">S\u76d2\u66ff\u6362<\/p>\n<p id=\"%E7%BD%AE%E6%8D%A2P-toc\" style=\"margin-left:80px\">\u7f6e\u6362P<\/p>\n<p id=\"%E5%AE%8C%E6%95%B4%E8%AE%A1%E7%AE%97%E6%A1%88%E4%BE%8B-toc\" style=\"margin-left:80px\">\u5b8c\u6574\u8ba1\u7b97\u6848\u4f8b<\/p>\n<p id=\"%E4%B8%89%E3%80%81%E5%AE%89%E5%85%A8%E6%80%A7%E5%88%86%E6%9E%90-toc\" style=\"margin-left:0px\">\u4e09\u3001\u5b89\u5168\u6027\u5206\u6790<\/p>\n<p id=\"%E5%AD%98%E5%9C%A8%E4%BA%92%E8%A1%A5%E5%AF%86%E9%92%A5-toc\" style=\"margin-left:80px\">\u5b58\u5728\u4e92\u8865\u5bc6\u94a5<\/p>\n<p id=\"%E5%AF%86%E9%92%A5%E9%95%BF%E5%BA%A6%E8%BF%87%E7%9F%AD%C2%A0(56%E4%BD%8D)%EF%BC%9A-toc\" style=\"margin-left:80px\">\u5bc6\u94a5\u957f\u5ea6\u8fc7\u77ed\u00a0(56\u4f4d)&#xff1a;<\/p>\n<p id=\"%E7%90%86%E8%AE%BA%E6%94%BB%E5%87%BB%E6%96%B9%E6%B3%95%EF%BC%9A-toc\" style=\"margin-left:80px\">\u7406\u8bba\u653b\u51fb\u65b9\u6cd5&#xff1a;<\/p>\n<p id=\"%E5%9B%9B%E3%80%81%E5%8F%98%E5%BD%A2%EF%BC%9A2-DES%20%E4%B8%8E%203-DES-toc\" style=\"margin-left:0px\">\u56db\u3001\u53d8\u5f62&#xff1a;2-DES \u4e0e 3-DES<\/p>\n<p id=\"2-DES%20(Double%20DES)%EF%BC%9A-toc\" style=\"margin-left:80px\">2-DES (Double DES)&#xff1a;<\/p>\n<p id=\"%E4%B8%AD%E9%97%B4%E7%9B%B8%E9%81%87%E6%94%BB%E5%87%BB-toc\" style=\"margin-left:120px\">\u4e2d\u95f4\u76f8\u9047\u653b\u51fb<\/p>\n<p id=\"%E6%94%BB%E5%87%BB%E5%A4%8D%E6%9D%82%E5%BA%A6%E5%88%86%E6%9E%90-toc\" style=\"margin-left:120px\">\u653b\u51fb\u590d\u6742\u5ea6\u5206\u6790<\/p>\n<p id=\"3-DES%20(Triple%20DES)%EF%BC%9A-toc\" style=\"margin-left:80px\">3-DES (Triple DES)&#xff1a;<\/p>\n<p id=\"3DES%E8%83%BD%E6%8A%B5%E6%8A%97%E4%B8%AD%E9%97%B4%E7%9B%B8%E9%81%87%E6%94%BB%E5%87%BB%EF%BC%9F-toc\" style=\"margin-left:120px\">3DES\u80fd\u62b5\u6297\u4e2d\u95f4\u76f8\u9047\u653b\u51fb&#xff1f;<\/p>\n<p id=\"%E6%80%BB%E7%BB%93-toc\" style=\"margin-left:0px\">\u603b\u7ed3<\/p>\n<hr \/>\n<h2 id=\"%E5%89%8D%E8%A8%80\">\u524d\u8a00<\/h2>\n<p>\u5728\u4fe1\u606f\u5b89\u5168\u9886\u57df&#xff0c;\u5bf9\u79f0\u5bc6\u7801\u7b97\u6cd5\u626e\u6f14\u7740\u6838\u5fc3\u89d2\u8272\u3002\u5176\u4e2d&#xff0c;\u5206\u7ec4\u5bc6\u7801\u56e0\u5176\u5bf9\u56fa\u5b9a\u957f\u5ea6\u6570\u636e\u5757&#xff08;\u5206\u7ec4&#xff09;\u8fdb\u884c\u72ec\u7acb\u52a0\u89e3\u5bc6\u7684\u7279\u6027\u800c\u88ab\u5e7f\u6cdb\u5e94\u7528\u3002\u800cDES&#xff08;Data Encryption Standard&#xff09;\u4f5c\u4e3a\u5386\u53f2\u4e0a\u6700\u5177\u5f71\u54cd\u529b\u7684\u5206\u7ec4\u5bc6\u7801\u4e4b\u4e00&#xff0c;\u5176\u7cbe\u5de7\u7684Feistel\u7ed3\u6784\u8bbe\u8ba1\u81f3\u4eca\u4ecd\u662f\u5bc6\u7801\u5b66\u6559\u5b66\u7684\u7ecf\u5178\u8303\u4f8b\u3002<\/p>\n<hr \/>\n<h2 id=\"%E4%B8%80%E3%80%81%E4%BB%8B%E7%BB%8D\">\u4e00\u3001\u4ecb\u7ecd<\/h2>\n<ul>\n<li>\u5bf9\u79f0\u5bc6\u7801&#xff08;\u52a0\u89e3\u5bc6\u4f7f\u7528\u4e00\u4e2a\u5bc6\u94a5&#xff09;\n<ul>\n<li>\u5206\u7ec4\u5bc6\u7801<\/li>\n<\/ul>\n<\/li>\n<li>Feistel\u7ed3\u6784&#xff08;\u8fed\u4ee316\u8f6e&#xff0c;\u52a0\u89e3\u5bc6\u7ed3\u6784\u76f8\u540c&#xff0c;\u53ea\u662f\u5bc6\u94a5\u987a\u5e8f\u76f8\u53cd&#xff09;<\/li>\n<\/ul>\n<p>\u53c2\u6570&#xff1a;<\/p>\n<p>\u660e\u5bc6\u6587\u5206\u7ec4&#xff1a;<\/p>\n<ul>\n<li>\u5904\u7406\u7684\u6570\u636e\u5757&#xff08;\u660e\u6587\/\u5bc6\u6587\u5206\u7ec4&#xff09;\u56fa\u5b9a\u4e3a<span style=\"color:#fe2c24\">64\u4f4d&#xff1b;\u6309\u6bd4\u7279&#xff08;\u5de6\u53f3\u5206\u621032bit&#xff09;<\/span><\/li>\n<\/ul>\n<p>\u5bc6\u94a5\u5206\u7ec4&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u521d\u59cb\u5bc6\u94a5\u957f\u5ea6&#xff1a;<span style=\"color:#fe2c24\">64\u4f4d<\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u6709\u6548\u5bc6\u94a5\u957f\u5ea6&#xff1a;<span style=\"color:#fe2c24\">56\u4f4d<\/span>&#xff08;\u5176\u4e2d8\u4f4d\u7528\u4e8e\u5947\u5076\u6821\u9a8c&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u6bcf\u8f6e\u5b9e\u9645\u4f7f\u7528\u7684\u5b50\u5bc6\u94a5\u957f\u5ea6&#xff1a;<span style=\"color:#fe2c24\">48\u4f4d<\/span>&#xff08;\u753156\u4f4d\u4e3b\u5bc6\u94a5\u7ecf\u8fc7\u4e00\u7cfb\u5217\u7f6e\u6362\u548c\u538b\u7f29\u751f\u6210&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>\u8fed\u4ee3\u6b21\u6570&#xff1a;<\/p>\n<ul>\n<li>\u6570\u636e\u5757\u7ecf\u5386<span style=\"color:#fe2c24\">16\u8f6e<\/span>\u5b8c\u5168\u76f8\u540c\u7684\u5904\u7406\u6d41\u7a0b&#xff0c;\u6bcf\u4e00\u8f6e\u90fd\u4f7f\u7528\u4e0d\u540c\u768448\u4f4d\u5b50\u5bc6\u94a5<\/li>\n<\/ul>\n<h2 id=\"%E4%BA%8C%E3%80%81%E5%8A%A0%E5%AF%86%E6%B5%81%E7%A8%8B%E2%9A%A0%EF%B8%8F\">\u4e8c\u3001<span style=\"color:#fe2c24\">\u52a0\u5bc6\u6d41\u7a0b\u26a0\ufe0f<\/span><\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"1039\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070000-68a02c70b9e2d.png\" width=\"987\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"896\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070001-68a02c71eed43.png\" width=\"706\" \/><\/p>\n<p>\u660e\u6587\u5206\u7ec4&#xff1a;<\/p>\n<ul>\n<li>\u6bcf\u7ec464bit<\/li>\n<\/ul>\n<p>\u521d\u59cb\u7f6e\u6362 (IP)&#xff1a;<\/p>\n<ul>\n<li>\u8f93\u5165\u768464\u4f4d\u660e\u6587\u9996\u5148\u901a\u8fc7\u4e00\u4e2a\u56fa\u5b9a\u7684\u521d\u59cb\u7f6e\u6362\u77e9\u9635 (IP)\u00a0\u8fdb\u884c\u6bd4\u7279\u91cd\u6392\u3002<\/li>\n<\/ul>\n<p>16\u8f6eFeistel\u8fed\u4ee3&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u62c6\u5206&#xff1a;\u5c06\u7f6e\u6362\u540e\u768464\u4f4d\u6570\u636e\u5206\u6210\u5de6\u53f3\u4e24\u534a&#xff1a;\u5de6\u534a\u90e8\u5206 (L\u2080, 32\u4f4d)\u00a0\u548c\u00a0\u53f3\u534a\u90e8\u5206 (R\u2080, 32\u4f4d)\u3002<\/p>\n<\/li>\n<li>\n<p>\u8f6e\u51fd\u6570 F \u5904\u7406 (\u6838\u5fc3)&#xff1a;<\/p>\n<li>\n<p>\u6269\u5c55\u7f6e\u6362 (E): \u5c06<span style=\"color:#fe2c24\">32\u4f4d\u7684\u00a0R\u1d62\u208b\u2081\u00a0\u6269\u5c55\u4e3a48\u4f4d<\/span>&#xff08;\u901a\u8fc7\u91cd\u590d\u67d0\u4e9b\u6bd4\u7279\u5b9e\u73b0&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u5b50\u5bc6\u94a5\u6df7\u5408 (XOR): \u5c06\u6269\u5c55\u540e\u768448\u4f4d\u7ed3\u679c\u4e0e\u5f53\u524d\u8f6e\u768448\u4f4d\u5b50\u5bc6\u94a5\u00a0K\u1d62\u00a0\u8fdb\u884c\u5f02\u6216 (XOR)\u00a0\u8fd0\u7b97\u3002<\/p>\n<\/li>\n<li>\n<p>S\u76d2\u66ff\u6362 (Substitution): \u5c0648\u4f4d\u7ed3\u679c\u5206\u62108\u7ec46\u4f4d\u6570\u636e&#xff0c;\u6bcf\u7ec4\u8f93\u5165\u4e00\u4e2a\u4e0d\u540c\u76846\u8f93\u51654\u8f93\u51faS\u76d2 (S-Box)\u3002\u6bcf\u4e2aS\u76d2\u6267\u884c\u5173\u952e\u7684\u975e\u7ebf\u6027\u66ff\u6362&#xff0c;\u8f93\u51fa4\u4f4d\u3002\u6b64\u6b65\u5c06<span style=\"color:#fe2c24\">48\u4f4d\u6570\u636e\u538b\u7f29\u56de32\u4f4d<\/span>\u3002<\/p>\n<\/li>\n<li>\n<p>\u7f6e\u6362 (P): \u5c06S\u76d2\u8f93\u51fa\u768432\u4f4d\u7ed3\u679c\u901a\u8fc7\u4e00\u4e2a\u56fa\u5b9a\u7684\u7f6e\u6362\u77e9\u9635 (P)\u00a0\u8fdb\u884c\u6bd4\u7279\u91cd\u6392\u3002\u8f93\u51fa\u5373\u4e3a\u8f6e\u51fd\u6570\u00a0F(R\u1d62\u208b\u2081, K\u1d62)\u00a0\u7684\u7ed3\u679c&#xff08;32\u4f4d&#xff09;\u3002<\/p>\n<\/li>\n<\/li>\n<li>\n<p>\u5408\u5e76\u4e0e\u4ea4\u6362&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u65b0\u7684\u5de6\u534a\u90e8\u5206&#xff1a;L\u1d62 &#061; R\u1d62\u208b\u2081<\/p>\n<\/li>\n<li>\n<p>\u65b0\u7684\u53f3\u534a\u90e8\u5206&#xff1a;R\u1d62 &#061; L\u1d62\u208b\u2081 XOR F(R\u1d62\u208b\u2081, K\u1d62)<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u91cd\u590d&#xff1a;\u4ee5\u4e0a\u6b65\u9aa4\u91cd\u590d\u6267\u884c16\u8f6e\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u6700\u7ec8\u5904\u7406&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u4ea4\u6362\u5408\u5e76&#xff1a;16\u8f6e\u8fed\u4ee3\u540e&#xff0c;\u4ea4\u6362\u6700\u540e\u5f97\u5230\u7684\u00a0L\u2081\u2086\u00a0\u548c\u00a0R\u2081\u2086&#xff08;\u5373\u8f93\u51fa\u00a0R\u2081\u2086 || L\u2081\u2086&#xff0c;\u517164\u4f4d&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u9006\u521d\u59cb\u7f6e\u6362 (IP\u207b\u00b9)&#xff1a;\u5c06\u4ea4\u6362\u5408\u5e76\u540e\u768464\u4f4d\u6570\u636e\u901a\u8fc7\u9006\u521d\u59cb\u7f6e\u6362\u77e9\u9635 (IP\u207b\u00b9)\u00a0\u8fdb\u884c\u6bd4\u7279\u91cd\u6392\u3002<\/p>\n<\/li>\n<li>\n<p>\u8f93\u51fa&#xff1a;\u5f97\u5230\u6700\u7ec8\u768464\u4f4d\u5bc6\u6587\u5206\u7ec4\u3002<\/p>\n<\/li>\n<\/ul>\n<p><span style=\"color:#fe2c24\">\u5173\u952e\u70b9&#xff1a;DES\u7684\u89e3\u5bc6\u6d41\u7a0b\u4e0e\u52a0\u5bc6\u6d41\u7a0b\u5b8c\u5168\u4e00\u81f4&#xff0c;\u552f\u4e00\u533a\u522b\u662f\u5b50\u5bc6\u94a5\u7684\u4f7f\u7528\u987a\u5e8f\u4e3a\u00a0K\u2081\u2086, K\u2081\u2085, &#8230;, K\u2081\u3002<\/span><\/p>\n<h4 id=\"%E6%89%A9%E5%B1%95%E7%BD%AE%E6%8D%A2E\">\u6269\u5c55\u7f6e\u6362E<\/h4>\n<ul>\n<li>\n<p>\u5c0632\u4f4d\u6570\u636e\u5212\u5206\u4e3a8\u4e2a4\u4f4d\u5757<\/p>\n<\/li>\n<li>\n<p>\u6bcf\u4e2a4\u4f4d\u5757\u6269\u5c55\u4e3a6\u4f4d&#xff1a;[b1 b2 b3 b4] \u2192 [b4 b1 b2 b3 b4 b1]<\/p>\n<\/li>\n<li>\n<p>\u5173\u952e\u7279\u6027&#xff1a;\u9996\u4f4d\u548c\u672b\u4f4d\u91cd\u590d&#xff08;\u5b9e\u73b0\u8f93\u5165\u6bd4\u7279\u7684\u6269\u6563&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>\u6269\u5c55\u8868<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"423\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070002-68a02c72c27f9.png\" width=\"483\" \/><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"199\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070003-68a02c736b2ac.png\" width=\"1109\" \/><\/p>\n<h4 id=\"S%E7%9B%92%E6%9B%BF%E6%8D%A2\">S\u76d2\u66ff\u6362<\/h4>\n<ul>\n<li>\n<p>\u5c0648\u4f4d\u8f93\u5165\u5206\u4e3a8\u7ec46\u4f4d\u6570\u636e<\/p>\n<\/li>\n<li>\n<p>\u6bcf\u7ec4\u8f93\u5165\u72ec\u7acb\u7684S\u76d2&#xff08;S1-S8&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u6bcf\u4e2aS\u76d2\u662f4\u00d716\u7684\u67e5\u627e\u8868&#xff08;6\u4f4d\u8f93\u5165 \u2192 4\u4f4d\u8f93\u51fa&#xff09;<\/p>\n<\/li>\n<\/ul>\n<p>S\u76d2\u67e5\u627e\u89c4\u5219&#xff1a;<\/p>\n<li>\n<p>\u53d66\u4f4d\u8f93\u5165&#xff1a;b1 b2 b3 b4 b5 b6<\/p>\n<\/li>\n<li>\n<p>\u884c\u53f7 &#061;\u00a0(b1 b6)\u2082 &#xff08;0-3&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u5217\u53f7 &#061;\u00a0(b2 b3 b4 b5)\u2082 &#xff08;0-15&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u8f93\u51fa &#061; S\u76d2[\u884c\u53f7][\u5217\u53f7]&#xff08;4\u4f4d&#xff09;<\/p>\n<\/li>\n<p>\u4ee5S1\u4e3a\u4f8b&#xff1a;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"235\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070004-68a02c7442f17.png\" width=\"1072\" \/><\/p>\n<p>\u8f93\u51656\u4f4d&#xff1a; 101101 \u884c\u53f7 &#061; (11)\u2082 &#061; 3 \u5217\u53f7 &#061; (0110)\u2082 &#061; 6 \u67e5S1[3][6] &#061; 7 \u2192 \u4e8c\u8fdb\u5236 0111<\/p>\n<h4 id=\"%E7%BD%AE%E6%8D%A2P\">\u7f6e\u6362P<\/h4>\n<ul>\n<li>\n<p>\u8f93\u51fa\u4f4di &#061; \u8f93\u5165\u4f4dP[i]&#xff08;\u6309\u8868\u4f4d\u7f6e\u6620\u5c04&#xff09;<\/p>\n<\/li>\n<li>\n<p>\u4f8b&#xff1a;\u8f93\u51fa\u7b2c1\u4f4d &#061; \u8f93\u5165\u7b2c16\u4f4d<\/p>\n<\/li>\n<li>\n<p>\u8f93\u51fa\u7b2c2\u4f4d &#061; \u8f93\u5165\u7b2c7\u4f4d<\/p>\n<\/li>\n<li>\n<p>&#8230;<\/p>\n<\/li>\n<li>\n<p>\u8f93\u51fa\u7b2c32\u4f4d &#061; \u8f93\u5165\u7b2c25\u4f4d<\/p>\n<\/li>\n<\/ul>\n<p>\u7f6e\u6362\u8868<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"385\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070005-68a02c7501a64.png\" width=\"283\" \/><\/p>\n<p>\u8f93\u516532\u4f4d&#xff1a; 0001 0010 0011 0100 0101 0110 0111 1000 \u7f6e\u6362\u540e&#xff1a; \u00a0 \u4f4d1 \u2190 \u4f4d16 (0) \u00a0 \u4f4d2 \u2190 \u4f4d7 (1) \u00a0 \u4f4d3 \u2190 \u4f4d20 (0) \u00a0 &#8230; \u00a0 \u4f4d32 \u2190 \u4f4d25 (1) \u8f93\u51fa&#xff1a;1000 1110 0010 1101 0101 0010 1010 0101<\/p>\n<h4 id=\"%E5%AE%8C%E6%95%B4%E8%AE%A1%E7%AE%97%E6%A1%88%E4%BE%8B\">\u5b8c\u6574\u8ba1\u7b97\u6848\u4f8b<\/h4>\n<p>\u8ba1\u7b97\u6b65\u9aa4&#xff1a;<\/p>\n<li>\n<p>E\u6269\u5c55&#xff1a;<\/p>\n<p> \u8f93\u516532\u4f4d&#xff1a;1100 1010 1111 0000 0011 0101 1001 0110<br \/>\n\u6269\u5c5548\u4f4d&#xff1a;011000 010111 111100 000001 001101 010110 101001 101100 <\/li>\n<li>\n<p>\u4e0e\u5b50\u5bc6\u94a5\u5f02\u6216&#xff1a;<\/p>\n<p> \u6269\u5c55\u540e&#xff1a;011000 010111 111100 000001 001101 010110 101001 101100<br \/>\nK\u1d62&#xff1a;   010110 101001 011010 110100 001011 110101 100110 111000<br \/>\n\u5f02\u6216\u7ed3\u679c&#xff1a;001110 111110 100110 110101 000110 100011 001111 010100 <\/li>\n<li>\n<p>S\u76d2\u66ff\u6362&#xff1a;<\/p>\n<p> \u5206\u7ec4&#xff1a;001110 111110 100110 110101 000110 100011 001111 010100<br \/>\nS1(001110)&#xff1a;\u884c&#061;00(0), \u5217&#061;0111(7) \u2192 13(1101)<br \/>\nS2(111110)&#xff1a;\u884c&#061;10(2), \u5217&#061;1111(15) \u2192 0(0000)<br \/>\n&#8230;&#xff08;\u5176\u4ed6S\u76d2\u7c7b\u4f3c&#xff09;<br \/>\n\u8f93\u51fa32\u4f4d&#xff1a;1101 0000 1001 0110 1110 1011 0010 1000 <\/li>\n<li>\n<p>P\u7f6e\u6362&#xff1a;<\/p>\n<p> \u8f93\u516532\u4f4d&#xff1a;1101 0000 1001 0110 1110 1011 0010 1000<br \/>\n\u7f6e\u6362\u540e&#xff1a;1010 1110 0001 1100 0010 1101 1000 0110&#xff08;\u6700\u7ec8F\u51fd\u6570\u8f93\u51fa&#xff09; <\/li>\n<h2 id=\"%E4%B8%89%E3%80%81%E5%AE%89%E5%85%A8%E6%80%A7%E5%88%86%E6%9E%90\" style=\"background-color:transparent\">\u4e09\u3001\u5b89\u5168\u6027\u5206\u6790<\/h2>\n<h4 id=\"%E5%AD%98%E5%9C%A8%E4%BA%92%E8%A1%A5%E5%AF%86%E9%92%A5\">\u5b58\u5728\u4e92\u8865\u5bc6\u94a5<\/h4>\n<p>\u5b89\u5168\u5f71\u54cd&#xff1a;\u53ef\u5c06\u7a77\u4e3e\u5bc6\u94a5\u641c\u7d22\u7a7a\u95f4\u51cf\u5c11\u4e00\u534a&#xff08;\u653b\u51fb\u8005\u53ea\u9700\u5c1d\u8bd5\u4e00\u534a\u5bc6\u94a5\u5373\u53ef\u9a8c\u8bc1\u4e24\u4e2a\u53ef\u80fd\u7ed3\u679c&#xff09;\u3002\u867d\u7136\u5b9e\u9645\u653b\u51fb\u4ef7\u503c\u6709\u9650&#xff0c;\u4f46\u5b83\u63ed\u793a\u4e86DES\u7ed3\u6784\u7684\u5185\u5728\u6570\u5b66\u6027\u8d28\u3002<\/p>\n<p>\u8fd9\u4e5f\u662fdes\u7684\u4e00\u4e2a\u91cd\u8981\u6570\u5b66\u6027\u8d28&#xff0c;\u79f0\u4e3a\u4e92\u8865\u7279\u6027\u6216\u53d6\u53cd\u7279\u6027&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u5982\u679c\u4f7f\u7528\u5bc6\u94a5\u00a0K\u00a0\u52a0\u5bc6\u660e\u6587\u00a0P\u00a0\u5f97\u5230\u5bc6\u6587\u00a0C\u3002<\/p>\n<\/li>\n<li>\n<p>\u90a3\u4e48\u4f7f\u7528\u5bc6\u94a5\u00a0K&#039;&#xff08;\u5373\u00a0K\u00a0\u7684\u9010\u4f4d\u53d6\u53cd&#xff09;\u52a0\u5bc6\u660e\u6587\u00a0P&#039;&#xff08;\u5373\u00a0P\u00a0\u7684\u9010\u4f4d\u53d6\u53cd&#xff09;&#xff0c;\u5f97\u5230\u7684\u5bc6\u6587\u5c06\u662f\u00a0C&#039;&#xff08;\u5373\u00a0C\u00a0\u7684\u9010\u4f4d\u53d6\u53cd&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u516c\u5f0f\u8868\u793a&#xff1a;DES\u2096&#039;(P&#039;) &#061; (DES\u2096(P))&#039;<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"%E5%AF%86%E9%92%A5%E9%95%BF%E5%BA%A6%E8%BF%87%E7%9F%AD%C2%A0(56%E4%BD%8D)%EF%BC%9A\">\u5bc6\u94a5\u957f\u5ea6\u8fc7\u77ed\u00a0(56\u4f4d)&#xff1a;<\/h4>\n<ul>\n<li>\n<p>\u5bc6\u94a5\u7a7a\u95f4\u4ec5\u6709 2\u2075\u2076 \u2248 7.2 \u00d7 10\u00b9\u2076 \u79cd\u53ef\u80fd\u3002<\/p>\n<\/li>\n<li>\n<p>\u73b0\u4ee3\u8ba1\u7b97\u80fd\u529b&#xff08;\u5982GPU\u3001\u4e13\u7528\u786c\u4ef6&#xff09;\u53ef\u5728\u6570\u5c0f\u65f6\u751a\u81f3\u66f4\u77ed\u65f6\u95f4\u5185\u5b8c\u6210\u7a77\u4e3e\u653b\u51fb&#xff08;\u66b4\u529b\u7834\u89e3&#xff09;\u30021998\u5e74\u7684DES\u6311\u6218\u8d5b\u9996\u6b21\u88ab\u516c\u5f00\u7834\u89e3\u5373\u662f\u660e\u8bc1\u3002<\/p>\n<\/li>\n<\/ul>\n<h4 id=\"%E7%90%86%E8%AE%BA%E6%94%BB%E5%87%BB%E6%96%B9%E6%B3%95%EF%BC%9A\">\u7406\u8bba\u653b\u51fb\u65b9\u6cd5&#xff1a;<\/h4>\n<ul>\n<li>\n<p>\u5dee\u5206\u5bc6\u7801\u5206\u6790 (Differential Cryptanalysis)&#xff1a;\u901a\u8fc7\u5206\u6790\u7279\u5b9a\u660e\u6587\u5dee\u5206\u5bf9\u5bf9\u5e94\u5bc6\u6587\u5dee\u5206\u7684\u5f71\u54cd\u6765\u6062\u590d\u5bc6\u94a5\u3002DES\u7684S\u76d2\u8bbe\u8ba1\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u62b5\u6297\u4e86\u8fd9\u79cd\u5f53\u65f6\u672a\u77e5\u7684\u653b\u51fb\u3002<\/p>\n<\/li>\n<li>\n<p>\u7ebf\u6027\u5bc6\u7801\u5206\u6790 (Linear Cryptanalysis)&#xff1a;\u5bfb\u627e\u660e\u6587\u3001\u5bc6\u6587\u548c\u5bc6\u94a5\u6bd4\u7279\u4e4b\u95f4\u7684\u6982\u7387\u7ebf\u6027\u903c\u8fd1\u5173\u7cfb\u6765\u6062\u590d\u5bc6\u94a5\u3002\u6bd4\u5dee\u5206\u5206\u6790\u66f4\u6709\u6548&#xff0c;\u4e5f\u662f\u73b0\u4ee3\u91cd\u8981\u7684\u5206\u6790\u624b\u6bb5\u3002<\/p>\n<\/li>\n<\/ul>\n<h2 id=\"%E5%9B%9B%E3%80%81%E5%8F%98%E5%BD%A2%EF%BC%9A2-DES%20%E4%B8%8E%203-DES\" style=\"background-color:transparent\">\u56db\u3001\u53d8\u5f62&#xff1a;2-DES \u4e0e 3-DES<\/h2>\n<p>\u4e3a\u514b\u670dDES\u5bc6\u94a5\u8fc7\u77ed\u7684\u95ee\u9898&#xff0c;\u53d1\u5c55\u51fa\u591a\u91cdDES\u65b9\u6848<\/p>\n<h4 id=\"2-DES%20(Double%20DES)%EF%BC%9A\">2-DES (Double DES)&#xff1a;<\/h4>\n<p><span style=\"color:#fe2c24\">\u4f7f\u7528\u4e24\u4e2a\u5bc6\u94a5&#xff0c;2\u6b21\u52a0\u5bc6<\/span><\/p>\n<ul>\n<li>\n<p>\u52a0\u5bc6&#xff1a;C &#061; E(K\u2082, E(K\u2081, P))<\/p>\n<\/li>\n<li>\n<p>\u89e3\u5bc6&#xff1a;P &#061; D(K\u2081, D(K\u2082, C))<\/p>\n<\/li>\n<li>\n<p>\u5bc6\u94a5\u957f\u5ea6&#xff1a;112\u4f4d&#xff08;2 \u00d7 56\u4f4d&#xff09;\u3002<\/p>\n<\/li>\n<li>\n<p>\u81f4\u547d\u7f3a\u9677&#xff1a;\u6613\u53d7<span style=\"color:#fe2c24\">\u4e2d\u95f4\u76f8\u9047\u653b\u51fb <\/span>(Meet-in-the-Middle Attack)\u3002\u653b\u51fb\u8005\u901a\u8fc7\u9884\u8ba1\u7b97\u548c\u5b58\u50a8\u00a0E(K\u2081, P)\u00a0\u4e0e\u00a0D(K\u2082, C)\u00a0\u7684\u4e2d\u95f4\u7ed3\u679c\u8fdb\u884c\u5339\u914d&#xff0c;\u53ef\u5c06\u6709\u6548\u653b\u51fb\u590d\u6742\u5ea6\u964d\u81f3\u7ea6 2\u2075\u2077&#xff0c;\u5b89\u5168\u6027\u4ec5\u7565\u9ad8\u4e8e\u5355DES&#xff0c;\u4e0d\u63a8\u8350\u4f7f\u7528\u3002<\/p>\n<\/li>\n<\/ul>\n<h5 id=\"%E4%B8%AD%E9%97%B4%E7%9B%B8%E9%81%87%E6%94%BB%E5%87%BB\">\u4e2d\u95f4\u76f8\u9047\u653b\u51fb<\/h5>\n<p>C &#061; E(K\u2082, E(K\u2081, P))\u00a0 \u53ef\u8f6c\u5316\u4e3a&#xff1a;E(K\u2081, P) &#061; D(K\u2082, C)<\/p>\n<p>\u653b\u51fb\u8005\u901a\u8fc7\u53cc\u5411\u8ba1\u7b97\u5e76\u5339\u914d\u4e2d\u95f4\u503c&#xff0c;\u5c06\u653b\u51fb\u590d\u6742\u5ea6\u4ece\u7406\u8bba\u4e0a\u76842\u00b9\u00b9\u00b2\u5927\u5e45\u964d\u81f32\u2075\u2077\u3002<\/p>\n<p>\u653b\u51fb\u6b65\u9aa4&#xff08;\u97001\u7ec4\u5df2\u77e5\u660e\u6587-\u5bc6\u6587\u5bf9(P, C)&#xff09;<\/p>\n<p>1.\u6b63\u5411\u8ba1\u7b97&#xff08;\u52a0\u5bc6\u65b9\u5411&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u679a\u4e3e\u6240\u67092\u2075\u2076\u4e2a\u53ef\u80fd\u7684K\u2081<\/li>\n<li>\u5bf9\u6bcf\u4e2aK\u2081\u8ba1\u7b97&#xff1a;T &#061; E(K\u2081, P)<\/li>\n<li>\u5b58\u50a8\u7ed3\u679c&#xff1a;\u5efa\u7acb(T, K\u2081)\u7684\u67e5\u627e\u8868&#xff08;\u7a7a\u95f4\u590d\u6742\u5ea62\u2075\u2076&#xff09;<\/li>\n<\/ul>\n<p>2.\u9006\u5411\u8ba1\u7b97&#xff08;\u89e3\u5bc6\u65b9\u5411&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u679a\u4e3e\u6240\u67092\u2075\u2076\u4e2a\u53ef\u80fd\u7684K\u2082<\/li>\n<li>\u5bf9\u6bcf\u4e2aK\u2082\u8ba1\u7b97&#xff1a;S &#061; D(K\u2082, C)<\/li>\n<li>\u5728\u67e5\u627e\u8868\u4e2d\u641c\u7d22\u5339\u914d\u7684T\u503c&#xff08;\u6ee1\u8db3T &#061; S&#xff09;<\/li>\n<\/ul>\n<p>3.\u5bc6\u94a5\u9a8c\u8bc1&#xff1a;<\/p>\n<ul>\n<li>\u5bf9\u6bcf\u4e2a\u5339\u914d\u7684(K\u2081, K\u2082)\u5019\u9009\u5bf9<\/li>\n<li>\u7528\u65b0\u660e\u6587-\u5bc6\u6587\u5bf9\u9a8c\u8bc1\u662f\u5426\u6b63\u786e<\/li>\n<li>\u82e5\u9a8c\u8bc1\u6210\u529f&#xff0c;\u5219\u83b7\u5f97\u6b63\u786e\u5bc6\u94a5<\/li>\n<\/ul>\n<h5 id=\"%E6%94%BB%E5%87%BB%E5%A4%8D%E6%9D%82%E5%BA%A6%E5%88%86%E6%9E%90\">\u653b\u51fb\u590d\u6742\u5ea6\u5206\u6790<\/h5>\n<table>\n<tr>\u653b\u51fb\u7c7b\u578b\u65f6\u95f4\u590d\u6742\u5ea6\u7a7a\u95f4\u590d\u6742\u5ea6\u5b9e\u9645\u5b89\u5168\u5f3a\u5ea6<\/tr>\n<tbody>\n<tr>\n<td>\u7406\u8bba\u7a77\u4e3e\u653b\u51fb<\/td>\n<td>2\u00b9\u00b9\u00b2<\/td>\n<td>\u6781\u5c0f<\/td>\n<td>112\u4f4d<\/td>\n<\/tr>\n<tr>\n<td>\u4e2d\u95f4\u76f8\u9047\u653b\u51fb<\/td>\n<td>2\u2075\u2077<\/td>\n<td>2\u2075\u2076<\/td>\n<td>\u4ec557\u4f4d<\/td>\n<\/tr>\n<tr>\n<td>\u5355DES\u653b\u51fb<\/td>\n<td>2\u2075\u2075<\/td>\n<td>\u6781\u5c0f<\/td>\n<td>55\u4f4d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u7a7a\u95f4\u4ee3\u4ef7&#xff1a;\u5b58\u50a82\u2075\u2076\u6761\u8bb0\u5f55\u7ea6\u970015,000 TB&#xff08;56\u4f4d\u5bc6\u94a5&#043;64\u4f4d\u4e2d\u95f4\u503c&#xff09;&#xff0c;\u73b0\u4ee3\u5206\u5e03\u5f0f\u7cfb\u7edf\u53ef\u5b9e\u73b0\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"865\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/08\/20250816070005-68a02c758b962.png\" width=\"649\" \/><\/p>\n<h4 id=\"3-DES%20(Triple%20DES)%EF%BC%9A\">3-DES (Triple DES)&#xff1a;<\/h4>\n<ul>\n<li>\n<p>\u5e38\u7528\u52a0\u5bc6\u6a21\u5f0f (EDE)&#xff1a;<\/p>\n<ul>\n<li>\n<p>C &#061; E(K\u2083, D(K\u2082, E(K\u2081, P)))&#xff08;\u52a0\u5bc6&#xff09;<\/p>\n<\/li>\n<li>\n<p>P &#061; D(K\u2081, E(K\u2082, D(K\u2083, C)))&#xff08;\u89e3\u5bc6&#xff09;<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>\u5bc6\u94a5\u9009\u9879&#xff1a;<\/p>\n<ul>\n<li>\n<p>\u4e09\u5bc6\u94a5 (Keying Option 1)&#xff1a;K\u2081,\u00a0K\u2082,\u00a0K\u2083\u00a0\u72ec\u7acb&#xff08;\u5171168\u4f4d&#xff09;\u3002\u5b89\u5168\u6027\u6700\u9ad8\u3002<\/p>\n<\/li>\n<li>\n<p>\u53cc\u5bc6\u94a5 (Keying Option 2)&#xff1a;K\u2081 &#061; 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